The intelligent return water cleaning system adopts the hollow rotor screw pump matching surface water injection system, which is mainly aimed at the well conditions in which the water quantity is small (or the water quantity is not stable) and the coal powder concentration is large in the process of coal-bed methane well drainage and production, resulting in the gas production is not stable. The underground coal powder in the normal production state can be continuously returned in large quantities, and the external displacement can be effectively controlled according to the drainage and production system. Ensure normal flow pressure drop.